Rails - Jul 2008 - undefined method `table_name'

Hi

I''m relative new to RoR - but I''m having a problem with some
model
relationships that I thought should have worked. Hope someone can
help.

The code...

MODELS:

class Delivery < ActiveRecord::Base
 belongs_to :vehicle
end

class Vehicle < ActiveRecord::Base
 has_many :deliveries

 def self.find_all_active
   Vehicle.find(:all, :order => ''name'', :conditions =>
[''is_active
= ?'', true])
 end

end

CONTROLLER:
 @vehicles = Vehicle.find_all_active

VIEW:
 <%= vehicle.deliveries.length %>


The error...
undefined method `table_name'' for Delivery:Class

Notes...
The problem seems to be the class method find_all_active. I tested the
equivalent calls in the console and they work fine - so why not when
the application is running?

Any comments appreciated

Thanks

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